Pileus Git - grits/blob - src/gis-opengl.c

   1 /*
   2  * Copyright (C) 2009 Andy Spencer <spenceal@rose-hulman.edu>
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 /* Tessellation, "finding intersecting triangles" */
  19 /* http://research.microsoft.com/pubs/70307/tr-2006-81.pdf */
  20 /* http://www.opengl.org/wiki/Alpha_Blending */
  21
  22 #include <config.h>
  23 #include <math.h>
  24 #include <gdk/gdkkeysyms.h>
  25 #include <gtk/gtk.h>
  26 #include <gtk/gtkgl.h>
  27 #include <GL/gl.h>
  28 #include <GL/glu.h>
  29
  30 #include "gis-opengl.h"
  31 #include "roam.h"
  32
  33 #define FOV_DIST   2000.0
  34 #define MPPX(dist) (4*dist/FOV_DIST)
  35
  36 // #define ROAM_DEBUG
  37
  38 /*************
  39  * ROAM Code *
  40  *************/
  41 static void set_visuals(GisOpenGL *self)
  42 {
  43         glMatrixMode(GL_MODELVIEW);
  44         glLoadIdentity();
  45
  46         /* Camera 1 */
  47         double lat, lon, elev, rx, ry, rz;
  48         gis_view_get_location(self->view, &lat, &lon, &elev);
  49         gis_view_get_rotation(self->view, &rx, &ry, &rz);
  50         glRotatef(rx, 1, 0, 0);
  51         glRotatef(rz, 0, 0, 1);
  52
  53         /* Lighting */
  54 #ifdef ROAM_DEBUG
  55         float light_ambient[]  = {0.7f, 0.7f, 0.7f, 1.0f};
  56         float light_diffuse[]  = {2.0f, 2.0f, 2.0f, 1.0f};
  57 #else
  58         float light_ambient[]  = {0.2f, 0.2f, 0.2f, 1.0f};
  59         float light_diffuse[]  = {5.0f, 5.0f, 5.0f, 1.0f};
  60 #endif
  61         float light_position[] = {-13*EARTH_R, 1*EARTH_R, 3*EARTH_R, 1.0f};
  62         glLightfv(GL_LIGHT0, GL_AMBIENT,  light_ambient);
  63         glLightfv(GL_LIGHT0, GL_DIFFUSE,  light_diffuse);
  64         glLightfv(GL_LIGHT0, GL_POSITION, light_position);
  65         glEnable(GL_LIGHT0);
  66         glEnable(GL_LIGHTING);
  67
  68         float material_ambient[]  = {0.2, 0.2, 0.2, 1.0};
  69         float material_diffuse[]  = {0.8, 0.8, 0.8, 1.0};
  70         float material_specular[] = {0.0, 0.0, 0.0, 1.0};
  71         float material_emission[] = {0.0, 0.0, 0.0, 1.0};
  72         glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT,  material_ambient);
  73         glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE,  material_diffuse);
  74         glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, material_specular);
  75         glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, material_emission);
  76         glDisable(GL_TEXTURE_2D);
  77         glDisable(GL_COLOR_MATERIAL);
  78
  79         /* Camera 2 */
  80         glTranslatef(0, 0, -elev2rad(elev));
  81         glRotatef(lat, 1, 0, 0);
  82         glRotatef(-lon, 0, 1, 0);
  83
  84         /* Misc */
  85         gdouble rg   = MAX(0, 1-(elev/20000));
  86         gdouble blue = MAX(0, 1-(elev/50000));
  87         glClearColor(MIN(0.65,rg), MIN(0.65,rg), MIN(1,blue), 1.0f);
  88         glColor4f(1, 1, 1, 1);
  89
  90         glDisable(GL_ALPHA_TEST);
  91
  92         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  93         glEnable(GL_BLEND);
  94
  95 #ifndef ROAM_DEBUG
  96         glCullFace(GL_BACK);
  97         glEnable(GL_CULL_FACE);
  98 #endif
  99
 100         glClearDepth(1.0);
 101         glDepthFunc(GL_LEQUAL);
 102         glEnable(GL_DEPTH_TEST);
 103
 104         glEnable(GL_LINE_SMOOTH);
 105
 106         glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 107         //glShadeModel(GL_FLAT);
 108 }
 109
 110
 111 /*************
 112  * Callbacks *
 113  *************/
 114 static void on_realize(GisOpenGL *self, gpointer _)
 115 {
 116         g_debug("GisOpenGL: on_realize");
 117         set_visuals(self);
 118         roam_sphere_update_errors(self->sphere);
 119 }
 120 static gboolean on_configure(GisOpenGL *self, GdkEventConfigure *event, gpointer _)
 121 {
 122         g_debug("GisOpenGL: on_configure");
 123         gis_opengl_begin(self);
 124
 125         double width  = GTK_WIDGET(self)->allocation.width;
 126         double height = GTK_WIDGET(self)->allocation.height;
 127         glViewport(0, 0, width, height);
 128
 129         glMatrixMode(GL_PROJECTION);
 130         glLoadIdentity();
 131         double ang = atan(height/FOV_DIST);
 132         gluPerspective(rad2deg(ang)*2, width/height, 1, 20*EARTH_R);
 133
 134 #ifndef ROAM_DEBUG
 135         roam_sphere_update_errors(self->sphere);
 136 #endif
 137
 138         gis_opengl_end(self);
 139         return FALSE;
 140 }
 141
 142 static void on_expose_plugin(GisPlugin *plugin, gchar *name, GisOpenGL *self)
 143 {
 144         set_visuals(self);
 145         glMatrixMode(GL_PROJECTION); glPushMatrix();
 146         glMatrixMode(GL_MODELVIEW);  glPushMatrix();
 147         gis_plugin_expose(plugin);
 148         glMatrixMode(GL_PROJECTION); glPopMatrix();
 149         glMatrixMode(GL_MODELVIEW);  glPopMatrix();
 150 }
 151 static gboolean on_expose(GisOpenGL *self, GdkEventExpose *event, gpointer _)
 152 {
 153         g_debug("GisOpenGL: on_expose - begin");
 154         gis_opengl_begin(self);
 155
 156         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 157
 158 #ifndef ROAM_DEBUG
 159         gis_plugins_foreach(self->plugins, G_CALLBACK(on_expose_plugin), self);
 160
 161         if (self->wireframe) {
 162                 set_visuals(self);
 163                 glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 164                 roam_sphere_draw(self->sphere);
 165         }
 166 #else
 167         set_visuals(self);
 168         glColor4f(0.0, 0.0, 9.0, 0.6);
 169         glDisable(GL_TEXTURE_2D);
 170         glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 171         roam_sphere_draw(self->sphere);
 172
 173         //roam_sphere_draw_normals(self->sphere);
 174 #endif
 175
 176         set_visuals(self);
 177         gis_opengl_end(self);
 178         gis_opengl_flush(self);
 179         g_debug("GisOpenGL: on_expose - end\n");
 180         return FALSE;
 181 }
 182
 183 static gboolean on_button_press(GisOpenGL *self, GdkEventButton *event, gpointer _)
 184 {
 185         g_debug("GisOpenGL: on_button_press - Grabbing focus");
 186         gtk_widget_grab_focus(GTK_WIDGET(self));
 187         return TRUE;
 188 }
 189
 190 static gboolean on_key_press(GisOpenGL *self, GdkEventKey *event, gpointer _)
 191 {
 192         g_debug("GisOpenGL: on_key_press - key=%x, state=%x, plus=%x",
 193                         event->keyval, event->state, GDK_plus);
 194
 195         double lat, lon, elev, pan;
 196         gis_view_get_location(self->view, &lat, &lon, &elev);
 197         pan = MIN(elev/(EARTH_R/2), 30);
 198         guint kv = event->keyval;
 199         gdk_threads_leave();
 200         if      (kv == GDK_Left  || kv == GDK_h) gis_view_pan(self->view,  0,  -pan, 0);
 201         else if (kv == GDK_Down  || kv == GDK_j) gis_view_pan(self->view, -pan, 0,   0);
 202         else if (kv == GDK_Up    || kv == GDK_k) gis_view_pan(self->view,  pan, 0,   0);
 203         else if (kv == GDK_Right || kv == GDK_l) gis_view_pan(self->view,  0,   pan, 0);
 204         else if (kv == GDK_minus || kv == GDK_o) gis_view_zoom(self->view, 10./9);
 205         else if (kv == GDK_plus  || kv == GDK_i) gis_view_zoom(self->view, 9./10);
 206         else if (kv == GDK_H) gis_view_rotate(self->view,  0, 0, -2);
 207         else if (kv == GDK_J) gis_view_rotate(self->view,  2, 0,  0);
 208         else if (kv == GDK_K) gis_view_rotate(self->view, -2, 0,  0);
 209         else if (kv == GDK_L) gis_view_rotate(self->view,  0, 0,  2);
 210
 211         /* Testing */
 212         else if (kv == GDK_w) {self->wireframe = !self->wireframe; gtk_widget_queue_draw(GTK_WIDGET(self));}
 213 #ifdef ROAM_DEBUG
 214         else if (kv == GDK_n) roam_sphere_split_one(self->sphere);
 215         else if (kv == GDK_p) roam_sphere_merge_one(self->sphere);
 216         else if (kv == GDK_r) roam_sphere_split_merge(self->sphere);
 217         else if (kv == GDK_u) roam_sphere_update_errors(self->sphere);
 218         gdk_threads_enter();
 219         gtk_widget_queue_draw(GTK_WIDGET(self));
 220 #else
 221         gdk_threads_enter();
 222 #endif
 223
 224         return TRUE;
 225 }
 226
 227 static gboolean _update_errors_cb(gpointer sphere)
 228 {
 229         roam_sphere_update_errors(sphere);
 230         return FALSE;
 231 }
 232 static void on_view_changed(GisView *view,
 233                 gdouble _1, gdouble _2, gdouble _3, GisOpenGL *self)
 234 {
 235         g_debug("GisOpenGL: on_view_changed");
 236         gdk_threads_enter();
 237         gis_opengl_begin(self);
 238         set_visuals(self);
 239 #ifndef ROAM_DEBUG
 240         g_idle_add_full(G_PRIORITY_HIGH_IDLE+30, _update_errors_cb, self->sphere, NULL);
 241         //roam_sphere_update_errors(self->sphere);
 242 #endif
 243         gis_opengl_redraw(self);
 244         gis_opengl_end(self);
 245         gdk_threads_leave();
 246 }
 247
 248 static gboolean on_idle(GisOpenGL *self)
 249 {
 250         //g_debug("GisOpenGL: on_idle");
 251         gdk_threads_enter();
 252         gis_opengl_begin(self);
 253         if (roam_sphere_split_merge(self->sphere))
 254                 gis_opengl_redraw(self);
 255         gis_opengl_end(self);
 256         gdk_threads_leave();
 257         return TRUE;
 258 }
 259
 260
 261 /***********
 262  * Methods *
 263  ***********/
 264 GisOpenGL *gis_opengl_new(GisWorld *world, GisView *view, GisPlugins *plugins)
 265 {
 266         g_debug("GisOpenGL: new");
 267         GisOpenGL *self = g_object_new(GIS_TYPE_OPENGL, NULL);
 268         self->world   = world;
 269         self->view    = view;
 270         self->plugins = plugins;
 271         g_object_ref(world);
 272         g_object_ref(view);
 273
 274         g_signal_connect(self->view, "location-changed", G_CALLBACK(on_view_changed), self);
 275         g_signal_connect(self->view, "rotation-changed", G_CALLBACK(on_view_changed), self);
 276
 277         self->sphere = roam_sphere_new(self);
 278
 279         return g_object_ref(self);
 280 }
 281
 282 void gis_opengl_center_position(GisOpenGL *self, gdouble lat, gdouble lon, gdouble elev)
 283 {
 284         glRotatef(lon, 0, 1, 0);
 285         glRotatef(-lat, 1, 0, 0);
 286         glTranslatef(0, 0, elev2rad(elev));
 287 }
 288
 289 void gis_opengl_render_tile(GisOpenGL *self, GisTile *tile)
 290 {
 291         if (!tile || !tile->data)
 292                 return;
 293         GList *triangles = roam_sphere_get_intersect(self->sphere,
 294                         tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
 295         if (!triangles)
 296                 g_warning("GisOpenGL: render_tiles - No triangles to draw: edges=%f,%f,%f,%f",
 297                         tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
 298         //g_message("rendering %4d triangles for tile edges=%7.2f,%7.2f,%7.2f,%7.2f",
 299         //              g_list_length(triangles), tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
 300         for (GList *cur = triangles; cur; cur = cur->next) {
 301                 RoamTriangle *tri = cur->data;
 302
 303                 gdouble lat[3] = {tri->p.r->lat, tri->p.m->lat, tri->p.l->lat};
 304                 gdouble lon[3] = {tri->p.r->lon, tri->p.m->lon, tri->p.l->lon};
 305
 306                 if (lon[0] < -90 || lon[1] < -90 || lon[2] < -90) {
 307                         if (lon[0] > 90) lon[0] -= 360;
 308                         if (lon[1] > 90) lon[1] -= 360;
 309                         if (lon[2] > 90) lon[2] -= 360;
 310                 }
 311
 312                 gdouble n = tile->edge.n;
 313                 gdouble s = tile->edge.s;
 314                 gdouble e = tile->edge.e;
 315                 gdouble w = tile->edge.w;
 316
 317                 gdouble londist = e - w;
 318                 gdouble latdist = n - s;
 319
 320                 gdouble xy[][3] = {
 321                         {(lon[0]-w)/londist, 1-(lat[0]-s)/latdist},
 322                         {(lon[1]-w)/londist, 1-(lat[1]-s)/latdist},
 323                         {(lon[2]-w)/londist, 1-(lat[2]-s)/latdist},
 324                 };
 325
 326                 glEnable(GL_TEXTURE_2D);
 327                 glBindTexture(GL_TEXTURE_2D, *(guint*)tile->data);
 328                 glBegin(GL_TRIANGLES);
 329                 glNormal3dv(tri->p.r->norm); glTexCoord2dv(xy[0]); glVertex3dv((double*)tri->p.r);
 330                 glNormal3dv(tri->p.m->norm); glTexCoord2dv(xy[1]); glVertex3dv((double*)tri->p.m);
 331                 glNormal3dv(tri->p.l->norm); glTexCoord2dv(xy[2]); glVertex3dv((double*)tri->p.l);
 332                 glEnd();
 333         }
 334         g_list_free(triangles);
 335 }
 336
 337 void gis_opengl_render_tiles(GisOpenGL *opengl, GisTile *tile)
 338 {
 339         /* Only render children if possible */
 340         gboolean has_children = TRUE;
 341         GisTile *child;
 342         gis_tile_foreach(tile, child)
 343                 if (!child || !child->data)
 344                         has_children = FALSE;
 345         if (has_children)
 346                 /* Only render children */
 347                 gis_tile_foreach(tile, child)
 348                         gis_opengl_render_tiles(opengl, child);
 349         else
 350                 /* No children, render this tile */
 351                 gis_opengl_render_tile(opengl, tile);
 352 }
 353
 354 void gis_opengl_set_height_func(GisOpenGL *self, GisTile *tile,
 355                 RoamHeightFunc height_func, gpointer user_data, gboolean update)
 356 {
 357         if (!tile)
 358                 return;
 359         /* TODO: get points? */
 360         GList *triangles = roam_sphere_get_intersect(self->sphere,
 361                         tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
 362         for (GList *cur = triangles; cur; cur = cur->next) {
 363                 RoamTriangle *tri = cur->data;
 364                 RoamPoint *points[] = {tri->p.l, tri->p.m, tri->p.r, tri->split};
 365                 for (int i = 0; i < G_N_ELEMENTS(points); i++) {
 366                         points[i]->height_func = height_func;
 367                         points[i]->height_data = user_data;
 368                         roam_point_update_height(points[i]);
 369                 }
 370         }
 371         g_list_free(triangles);
 372 }
 373
 374 static void _gis_opengl_clear_height_func_rec(RoamTriangle *root)
 375 {
 376         if (!root)
 377                 return;
 378         RoamPoint *points[] = {root->p.l, root->p.m, root->p.r, root->split};
 379         for (int i = 0; i < G_N_ELEMENTS(points); i++) {
 380                 points[i]->height_func = NULL;
 381                 points[i]->height_data = NULL;
 382                 roam_point_update_height(points[i]);
 383         }
 384         _gis_opengl_clear_height_func_rec(root->kids[0]);
 385         _gis_opengl_clear_height_func_rec(root->kids[1]);
 386 }
 387 void gis_opengl_clear_height_func(GisOpenGL *self)
 388 {
 389         for (int i = 0; i < G_N_ELEMENTS(self->sphere->roots); i++)
 390                 _gis_opengl_clear_height_func_rec(self->sphere->roots[i]);
 391 }
 392
 393 void gis_opengl_redraw(GisOpenGL *self)
 394 {
 395         g_debug("GisOpenGL: redraw");
 396         gtk_widget_queue_draw(GTK_WIDGET(self));
 397 }
 398 void gis_opengl_begin(GisOpenGL *self)
 399 {
 400         g_assert(GIS_IS_OPENGL(self));
 401
 402         GdkGLContext   *glcontext  = gtk_widget_get_gl_context(GTK_WIDGET(self));
 403         GdkGLDrawable  *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(self));
 404
 405         if (!gdk_gl_drawable_gl_begin(gldrawable, glcontext))
 406                 g_assert_not_reached();
 407 }
 408 void gis_opengl_end(GisOpenGL *self)
 409 {
 410         g_assert(GIS_IS_OPENGL(self));
 411         GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(self));
 412         gdk_gl_drawable_gl_end(gldrawable);
 413 }
 414 void gis_opengl_flush(GisOpenGL *self)
 415 {
 416         g_assert(GIS_IS_OPENGL(self));
 417         GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(self));
 418         if (gdk_gl_drawable_is_double_buffered(gldrawable))
 419                 gdk_gl_drawable_swap_buffers(gldrawable);
 420         else
 421                 glFlush();
 422         gdk_gl_drawable_gl_end(gldrawable);
 423 }
 424
 425
 426 /****************
 427  * GObject code *
 428  ****************/
 429 G_DEFINE_TYPE(GisOpenGL, gis_opengl, GTK_TYPE_DRAWING_AREA);
 430 static void gis_opengl_init(GisOpenGL *self)
 431 {
 432         g_debug("GisOpenGL: init");
 433         /* OpenGL setup */
 434         GdkGLConfig *glconfig = gdk_gl_config_new_by_mode(
 435                         GDK_GL_MODE_RGBA   | GDK_GL_MODE_DEPTH |
 436                         GDK_GL_MODE_DOUBLE | GDK_GL_MODE_ALPHA);
 437         if (!glconfig)
 438                 g_error("Failed to create glconfig");
 439         if (!gtk_widget_set_gl_capability(GTK_WIDGET(self),
 440                                 glconfig, NULL, TRUE, GDK_GL_RGBA_TYPE))
 441                 g_error("GL lacks required capabilities");
 442         g_object_unref(glconfig);
 443
 444         gtk_widget_set_size_request(GTK_WIDGET(self), 600, 550);
 445         gtk_widget_set_events(GTK_WIDGET(self),
 446                         GDK_BUTTON_PRESS_MASK |
 447                         GDK_ENTER_NOTIFY_MASK |
 448                         GDK_KEY_PRESS_MASK);
 449         g_object_set(self, "can-focus", TRUE, NULL);
 450
 451 #ifndef ROAM_DEBUG
 452         self->sm_source[0] = g_timeout_add_full(G_PRIORITY_HIGH_IDLE+30, 33,  (GSourceFunc)on_idle, self, NULL);
 453         self->sm_source[1] = g_timeout_add_full(G_PRIORITY_HIGH_IDLE+10, 500, (GSourceFunc)on_idle, self, NULL);
 454 #endif
 455
 456         g_signal_connect(self, "realize",            G_CALLBACK(on_realize),      NULL);
 457         g_signal_connect(self, "configure-event",    G_CALLBACK(on_configure),    NULL);
 458         g_signal_connect(self, "expose-event",       G_CALLBACK(on_expose),       NULL);
 459
 460         g_signal_connect(self, "button-press-event", G_CALLBACK(on_button_press), NULL);
 461         g_signal_connect(self, "enter-notify-event", G_CALLBACK(on_button_press), NULL);
 462         g_signal_connect(self, "key-press-event",    G_CALLBACK(on_key_press),    NULL);
 463 }
 464 static GObject *gis_opengl_constructor(GType gtype, guint n_properties,
 465                 GObjectConstructParam *properties)
 466 {
 467         g_debug("GisOpengl: constructor");
 468         GObjectClass *parent_class = G_OBJECT_CLASS(gis_opengl_parent_class);
 469         return parent_class->constructor(gtype, n_properties, properties);
 470 }
 471 static void gis_opengl_dispose(GObject *_self)
 472 {
 473         g_debug("GisOpenGL: dispose");
 474         GisOpenGL *self = GIS_OPENGL(_self);
 475         if (self->sm_source[0]) {
 476                 g_source_remove(self->sm_source[0]);
 477                 self->sm_source[0] = 0;
 478         }
 479         if (self->sm_source[1]) {
 480                 g_source_remove(self->sm_source[1]);
 481                 self->sm_source[1] = 0;
 482         }
 483         if (self->sphere) {
 484                 roam_sphere_free(self->sphere);
 485                 self->sphere = NULL;
 486         }
 487         if (self->world) {
 488                 g_object_unref(self->world);
 489                 self->world = NULL;
 490         }
 491         if (self->view) {
 492                 g_object_unref(self->view);
 493                 self->view = NULL;
 494         }
 495         G_OBJECT_CLASS(gis_opengl_parent_class)->dispose(_self);
 496 }
 497 static void gis_opengl_finalize(GObject *_self)
 498 {
 499         g_debug("GisOpenGL: finalize");
 500         GisOpenGL *self = GIS_OPENGL(_self);
 501         G_OBJECT_CLASS(gis_opengl_parent_class)->finalize(_self);
 502 }
 503 static void gis_opengl_class_init(GisOpenGLClass *klass)
 504 {
 505         g_debug("GisOpenGL: class_init");
 506         GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
 507         gobject_class->constructor  = gis_opengl_constructor;
 508         gobject_class->dispose      = gis_opengl_dispose;
 509         gobject_class->finalize     = gis_opengl_finalize;
 510 }